Digital Equipment DIGITAL Server 9100 Series User manual

DIGITAL Server 9100 Series
User’s Guide
Part Number: ER-M2XWW-UA. A01
Digital Equipment Corporation

January 1998
The information in this document is subject to change without notice and should not be construed as a
commitment by Digital Equipment Corporation.
Digital Equipment Corporation assumes no responsibility for any errors that might appear in this
document.
The software described in this document is furnished under a license and may be used or copied only in
accordance with the terms of such license. No responsibility is assumed for the use or reliability of
software or equipment that is not supplied by Digital Equipment Corporation or its affiliated companies.
Restricted Rights: Use, duplication, or disclosure by the U.S. Government is subject to restrictions as set
forth in subparagraph (c) (1) (ii) of the Rights in Technical Data and Computer Software clause at
DFARS 252.227-7013.
DIGITAL Server 9100 Series User’s Guide
Copyright1998 Digital Equipment Corporation
Portions of this document contain material copyrighted by NCR Corporation, Dayton, Ohio, U.S.A.
All Rights Reserved.
Adaptec, the Adaptec logo, AHA, Altra, AVA, EZ-SCSISelect, and SlimSCSI are trademarks of Adaptec,
Inc. which may be registered in some jurisdictions.
IBM, AT, OS/2, and Micro Channel are registered trademarks of International Business
Machines Corporation.
DEC and the DIGITAL logo are registered trademarks of Digital Equipment Corporation.
Intel and Pentium-Pro are registered trademarks of Intel Corporation.
Novell and NetWare are registered trademarks of Novell, Inc.
PhoenixBIOS is a trademark of Phoenix Technologies Ltd.
SIMM is a registered trademark of Wang Laboratories.
Windows, Windows NT, MS-DOS, MS, and Microsoft are registered trademarks of Microsoft
Corporation.
All other trademarks are owned by their respective owners. Microsoft Corporation’s license agreement
precludes copying, disassembling, or reverse compiling software programs, or making any backup copies
of the software programs. You are not authorized to copy program files, or use any backup diskette
(made for the purpose of data backup and recovery from serious Flash failures) on any other system.

DIGITAL Server 9100 Series User's Guide iii
Table of Contents
Preface
Who Should Read This Book ...........................................................................................................................v
How To Use This Book ....................................................................................................................................v
Conventions Used ............................................................................................................................................v
Related Publications....................................................................................................................................... vi
Chapter 1
Server Description
Warnings and Cautions................................................................................................................................ 1-2
Terms, Conventions, and Related Documents............................................................................................... 1-2
Typical Configurations................................................................................................................................. 1-2
Expanding the Server Configuration............................................................................................................ 1-3
System Features Summary ........................................................................................................................... 1-4
Chassis Back Features and Controls.................................................................................................................... 1-5
Chassis Front Features and Controls................................................................................................................... 1-6
SCSI Drive Status LED Descriptions............................................................................................................ 1-7
Front Panel Interface........................................................................................................................................... 1-8
System Board Sets ............................................................................................................................................ 1-10
Board Set for a Dual System Board Configuration...................................................................................... 1-10
Primary System Board Features.................................................................................................................. 1-10
Secondary System Board Features.............................................................................................................. 1-11
Configuration Restrictions for System Boards ............................................................................................ 1-12
Primary System Board Connector and Component Locations ..................................................................... 1-13
Secondary System Board Connector and Component Locations.................................................................. 1-14
Processor Boards........................................................................................................................................ 1-15
Processors.................................................................................................................................................. 1-15
Bus Termination Board.............................................................................................................................. 1-15
Memory ..................................................................................................................................................... 1-16
Add-In Board Slots .................................................................................................................................... 1-18
SCSI Controllers........................................................................................................................................ 1-20
External Primary System Board Connectors............................................................................................... 1-21
Peripherals........................................................................................................................................................ 1-22
SCSI-2 Hard Drive Bays ............................................................................................................................ 1-22
SCSI Drive Hot-Swap Backplane ............................................................................................................... 1-23
Ultra SCSI Drive Considerations................................................................................................................ 1-24
Removable Media Drive Bays .................................................................................................................... 1-24
Power System ................................................................................................................................................... 1-25
Power Supplies........................................................................................................................................... 1-25
Interlock Circuit......................................................................................................................................... 1-26
Power Distribution Backplane.................................................................................................................... 1-27
Controlling Access to Power On/Off .......................................................................................................... 1-27

Contents
iv Table of Contents
System Security Features ...................................................................................................................................1-28
Software Locks via the System Configuration Utility (SCU)........................................................................1-29
Software Locks via the BIOS Setup Utility..................................................................................................1-29
Using Passwords.........................................................................................................................................1-30
Service Philosophy.............................................................................................................................................1-31
Regulatory Statements and Warranty.................................................................................................................1-32
Safety Certifications....................................................................................................................................1-32
Emission/Immunity Certifications...............................................................................................................1-32
Warranty ....................................................................................................................................................1-33
Chapter 2
Installing and Removing System Components
Terms, Conventions, and Related Documents .............................................................................................. 2-1
Tools and Supplies Needed .......................................................................................................................... 2-1
Warnings and Cautions................................................................................................................................ 2-2
Installing or Swapping a SCSI Drive in a Hot-Swap Bay .................................................................................... 2-3
Electrostatic Discharge (ESD) and Protection .............................................................................................. 2-3
No Need to Turn Off Power ......................................................................................................................... 2-3
When to Replace Drive................................................................................................................................ 2-3
Status LEDs................................................................................................................................................. 2-3
Installing or Swapping a Drive .................................................................................................................... 2-5
Removing and Installing Power Supplies............................................................................................................ 2-6
Removing a Power Supply ........................................................................................................................... 2-6
Installing a Power Supply ............................................................................................................................ 2-7
Chapter 3
System Security
Terms, Conventions, and Related Documents .............................................................................................. 3-1
Cabinet Security Features ................................................................................................................................... 3-1
BIOS and Configuration Utility Security Features............................................................................................... 3-2
Enabling Security Features........................................................................................................................... 3-2
Chapter 4
Troubleshooting
Terms, Conventions, and Related Documents .............................................................................................. 4-1
Codes and Error Messages.................................................................................................................................. 4-2
Logging of Critical Events........................................................................................................................... 4-2
POST Terminal Error Beep Codes............................................................................................................... 4-2
POST Error Codes and Messages................................................................................................................. 4-3
Problems and Solutions....................................................................................................................................... 4-5
Resetting The System................................................................................................................................... 4-5
System Reset Checklist ................................................................................................................................ 4-6
Running New Application Software............................................................................................................. 4-7
After the System Has Been Running Correctly............................................................................................. 4-7
Additional Troubleshooting Procedures........................................................................................................ 4-8
Running System Diagnostics........................................................................................................................ 4-9
Specific Problems and Corrective Actions...................................................................................................4-10
Index...........................................................................................................................................................Index-1

DIGITAL Server 9100 Series User's Guide v
Preface
Who Should Read This Book
This book is written for the person who installs and administers the server.
How To Use This Book
This book is organized as follows:
• Chapter 1: Server Description – provides an overview of the server and its components
• Chapter 2: Installing and Removing System Components– procedures for installing and removing
power supplies and hot-swapping a SCSI disk drive
• Chapter 3: System Security – provides information about system security
• Chapter 4: Troubleshooting – provides troubleshooting information (including error codes and some
common problems and solutions)
Conventions Used
The following conventions are used throughout this guide to help you understand the text.
Symbols
The symbol > is used in showing you how to select a menu item. For example, the entry System Config
Utils>Execute SCU instructs you to select the Execute SCU item in the System Config Utils menu.
Acronyms
The first time an acronym is used in a chapter, it is spelled out. Subsequent uses in the chapter show only
the acronym. For example, the first time “System Configuration Utility” is used in the chapter, it is shown
as System Configuration Utility (SCU). Later references to System Configuration Utility use SCU.

Preface
vi Preface
Typography
In this document, special typefaces are used to distinguish certain kinds of information.
Courier
Used for operator entry, commands, and screen messages.
Bold
Used for utility names and for emphasis in instructions.
Italics
Used for document names, path names, and file names.
CAPS
Keys and buttons are displayed in capital letters.
“Quotes”
Used for chapter and section references within the guide and for menu selections.
Special Notices
This book may contain special notices to you, which are labeled and described below:
Warnings −Text marked as WARNINGS alert you to situations where personal injury is possible.
Cautions −CAUTIONS indicate situations where equipment damage or data loss is possible.
Important −Text marked as IMPORTANT notifies you of significant and consequential information.
Related Publications
For additional information, refer to the following books:
• DIGITAL Server 9100 Series System Software Guide
• DIGITAL Server 9100 Series Installation Guide
• DIGITAL Server 9100 Series Site Preparation Guide
• AMIDiag User’s Guide (available on the Quick Launch CD-ROM)

DIGITAL Server 9100 Series User's Guide 1-1
Chapter 1
Server Description
The server uses PentiumPro symmetric multiprocessing (SMP) and peripheral component interconnect
input/output (PCI I/O) to provide unparalleled reliability, investment protection, scalability, and
price/performance.
The server provides superior processing and I/O power with support for four to eight Pentium Pro
processors, four PCI busses, and up to three onboard SCSI (Small Computer System Interface) busses for
the fastest application and network performance.
The server increases system availability through:
• ECC (Error Checking and Correction) memory
• Hot-swappable disk drives (“hot-swappable” refers to a component that you can replace with the
system power on)
• Hot-swappable redundant power supplies
• Redundant cooling
• Integrated server management hardware and software
By providing internal expandability up to 12 SCSI disk drives, 4 gigabytes (GB) of memory, 15 PCI slots,
and 4 EISA slots, the server provides world-class investment protection for even the fastest-growing
customer applications.
This server system is designed for use in applications where downtime must be minimized. To this end,
the server includes or has the option to include the following:
• Optional power system redundancy. In a system configured with the appropriate number of power
supplies for redundancy (two in some system configurations and three in others), the system continues
to operate with a single power supply failure.
• Self-contained, hot-swappable power supply units. Power supplies can be easily installed or
removed from the back of the chassis. If you have a redundant power supply configuration, you can
remove and install a power supply while the system is running.
• Easily accessible SCSI drive bays. The bays are accessible from the front of the chassis.
• Hot-swappable SCSI drive backplane. You can remove a failed drive and install a new drive
without turning the system power off.
• Failure monitoring. Hardware monitors (temperature and voltage) and software monitors to indicate
failures.

Chassis Back Features and Controls
1-2 Server Description
Warnings and Cautions
Overload condition, power supplies: The 625-watt power supplies are hot-swappable. You do not have
to turn the power off when removing or installing power supplies. However, if you remove a power supply
with the power on, your server must have a redundant power supply configuration. Otherwise, an overload
condition might occur and cause the system to shut down.
Electromagnetic interference (EMI), removable media bays: The system has four 5.25-inch half-
height bays accessible from the front. These bays are convenient for diskette, tape, and CD-ROM drives
(removable media). Because of the EMI generated by hard drives and the increased susceptibility to
electrostatic discharge (ESD), we do not recommend putting hard drives in the 5.25-inch half-height bays.
Hazardous conditions, devices and cables: Hazardous electrical conditions may be present on power,
telephone, and communication cables. Turn off the system and disconnect the power cord,
telecommunications systems, networks, and modems attached to the system before removing the covers
from the system.
Exceeding limits, accessory/option adapter boards: Accessory/option adapter board outputs may
exceed National Electrical Code (NEC) Class 2 or limited power source limits and must be installed with
the appropriate interconnecting cabling in accordance with NEC regulations.
Terms, Conventions, and Related Documents
Refer to the “Preface” of this document for important information on how to use this book, terms and
conventions, and related documents.
When used in this chapter, the term “configuration utility” refers to the SCU (System Configuration
Utility). The “Configuring Your Server” section of Chapter 3 of the DIGITAL Server 9100 Series System
Software Guide discusses how to use this utility in detail.
Typical Configurations
A typical configuration for a server with two system boards could include the following:
• 1 GB memory
• Six processors
• Three processor boards and one termination board
• Diskette drive
• Six SCSI hard drives in a RAID configuration (Redundant Array of Independent Disks)
• Two SCSI drive backplanes
• CD-ROM drive
• Two 625-watt power supplies

Chassis Back Features and Controls
DIGITAL Server 9100 Series User's Guide 1-3
Expanding the Server Configuration
As server/client needs grow, you can expand the system by adding processors, memory, drives, and power
supplies. Following is a description of the expandability limits for the above components:
• The primary system board and the secondary system board have two slots each for processor boards.
Either a processor board or a bus termination board must be plugged into each processor board
connector.
• 4 GB memory board supports 16 DIMM (Dual Inline Memory Module) devices for a minimum
memory size of 128 MB up to a total of 4 GB of memory. Maximum of two memory boards for dual
system board configurations.
• The primary system board has four EISA and seven PCI slots for add-in boards. (The fourth add-in
board slot from the bottom is a shared PCI/EISA bus slot. The term “shared” indicates that there is a
PCI and an EISA slot accessible from one external add-in board slot.) The secondary system board
has eight PCI slots.
• Chassis can hold 17 drives: 12 hot-swap bays for 3.5-inch SCSI-2 SCA (Single Connector
Attachment) hard drives; four 5.25-inch half-height bays for removable media drives; one 3.5-inch
bay with diskette drive already installed.
• Chassis supports from one to three power supplies.

Chassis Back Features and Controls
1-4 Server Description
System Features Summary
The following table summarizes the features of the system.
Feature Description
Modular board set System is intended for use with a modular board set based on Pentium Pro
technology; it supports up to eight processors and up to 8 GB of memory.
Add-in board support Rail and back panel slots support up to 18 add-in boards.
3.5-inch diskette drive A 3.5-inch diskette drive is externally accessible.
12 locations for 3.5-
inch SCSI-2 hard drives Two backplanes each hold six 3.5-inch hot-swappable SCSI-2 hard drives (for a total of 12 SCSI drives). The drive bays are secure behind a lockable metal
EMI door. You can swap drives in or out of the system with power on. The
array of drives allows easy setup of RAID applications.
Hot-swappable
backplane A hot-swappable backplane is part of each 3.5-inch drive bay assembly for SCSI drives. The backplane is designed for wide and fast SCSI-2 devices that
use the industry standard 80-pin Single Connector Attachment (SCA). Each
backplane consists of two rows of three drive connectors. A system may
contain one or two of these backplanes (supporting 6 or 12 drives).
Four locations for
removable media drives Four externally accessible 5.25-inch half-height bays are available for diskette, CD-ROM, and/or tape drives.
Power supply From one to three hot-swappable 625-watt auto-ranging power supplies are
easily removed and installed. The server configuration requires a minimum of
two power supplies.
Cooling fans Each power supply has an integral cooling fan. In addition, there are eight fans
within the cabinet to provide cooling for boards and drives.
Security Mechanical: Two metal padlock loops (at the back of each side panel). Two
intrusion sensors (one on each side panel). A padlock loop and an intrusion
sensor (at the metal EMI door).
BIOS: Security menu offers a range of security options (for example, setting
administrative and user passwords, Password on Boot, Video Blanking,
Secure Mode Timer).
SCU: Security Subsystems Group options available include, for example,
Lockout Timer, Secure Boot Mode, Floppy Write Protect, Reset/Power Switch
Locking).
For more information on system security, see “System Security” in this
chapter.
Software-related
utilities, setup Diagnostic Partition, BIOS Setup Utility, System Configuration Utility (SCU),
SCSI
Select
Utility.
System management Inter-Integrated Circuit interface (I2C) for diagnostic and intra-chassis
communication.

Chassis Back Features and Controls
DIGITAL Server 9100 Series User's Guide 1-5
Chassis Back Features and Controls
The following figure shows the chassis back features and controls.
Chassis Back Features and Controls
OM04357
A
B1
B2
B3
C
D
O
N
M
L
D
F
G
H
K
I
J
E
A AC input power connector Single input for 240 volts
B Power supplies (3 shown)
B1 = Power supply 1
B2 = Power supply 2
B3 = Power supply 3
Two supplies:
Three supplies: High-end system (required for this server configuration) High-end system (required for N+1 redundancy)
C Power supply status LEDs Status descriptions:
Green LED on Power supply is good.
LED off Indicates a power supply failure if the system is on.
D Side cover padlock loops One on each side, at the back
E PCI slots Eight dedicated PCI slots (secondary system board)
F Keyboard PS/2-compatible 6-pin connector
G COM2 Serial port 9-pin connector.
H VGA VGA monitor 15-pin connector
I Mouse PS/2-compatible 6-pin connector
J COM1 Serial port 9-pin connector.
K LPT1 LPT1 25-pin parallel port connector
L PCI slots Six dedicated PCI add-in board slot locations (primary system board)
M PCI/EISA slot One shared PCI/EISA slot (primary system board)
N EISA slots Three dedicated EISA add-in board slot locations (primary system board)
O Knockouts Available to route SCSI signals to peripheral boxes

Chassis Front Features and Controls
1-6 Server Description
Chassis Front Features and Controls
The following figure shows the chassis front features and controls.
Chassis Front Features and Controls
A
K
L
EBFCHGDI
OM04358
J
A Activity light for 3.5-
inch diskette drive When lit, drive is in use.
B Ejector button for 3.5-
inch diskette drive Press to eject diskette.
C Power on/off switch
(convex button) Press to turn system DC power on or off. For system security, the power- off function can be disabled via the BIOS Secure Mode option.
D Reset switch (concave
button) Press to cause a hard reset to the system; the power-on self-test (POST) runs. The Reset switch can be disabled via the BIOS Secure Mode option.
E LED status indicator:
Power-on, green When lit, power is present in system (+5 Vdc). When off, power is turned off or the power source is disrupted.
F LED status indicator:
Power-fail, yellow When lit, indicates either a power supply failure or an intrusion event (removal of a cover with power on).
G LED status indicator:
Fan-fail, yellow When lit, a fan has failed.
H LED status indicator:
Drive-fault, yellow When lit, a SCSI drive has failed.
I LCD panel Displays information about processor type. May be customized with user-
designated string (via the SCU).
J Small bezel door Open panel to access removable media bays
K Front cover Cosmetic panel
L Large bezel door Open panel to access up to 12 hard disk bays

Chassis Front Features and Controls
DIGITAL Server 9100 Series User's Guide 1-7
SCSI Drive Status LED Descriptions
You can pinpoint a faulty SCSI drive to remove by checking the status LEDs. The LEDs occur in sets of
three above each of the 12 drive bays. The following table shows the meaning of the status LEDs.
SCSI Drive
Present, Power On
Green LED
SCSI Drive
Active
Green LED
SCSI Drive
Faulty*
Yellow LED
Description and Action If Needed
On Off Off
Drive is present with power.
On Blinking Off
Drive is present with power and is being accessed.
Off Off On
Drive CAN be replaced. Steady yellow fault light
indicates drive has a problem. Power to drive is
off.
On Off Slow
blinking
Drive SHOULD NOT be replaced at this time. A
slowly blinking yellow fault light indicates a drive
that has just been replaced is in recovery mode
(drive array being rebuilt). Power to drive is on.
Off Off Off
There is no drive installed in the bay or system
power is off.
* Table assumes a SCSI host controller is installed to send SAF-TE (SCSI Accessed Fault-Tolerant Enclosures)
control signals to the drive fault LED.
Note: The DIGITAL Server 9100 series utilizes a Fault Reporting mechanism called SAF-TE (SCSI
Accessed Fault Tolerant Enclosure) for reporting hot-swap disk drive activity and status. All other
DIGITAL Servers as well as external Expansion Cabinets use the DIGITAL Fault-Bus for reporting of
hot-swap disk drive activity and status. The Mylex RAID controllers provide support for both types of
fault reporting and are shipped configured for SAF-TE when factory installed or DIGITAL Fault-Bus
when ordered as standalone options. A RAID controller can be configured for SAF-TE or Fault-Bus but
not both. Consequently, a RAID controller configuration with one channel connected to internal hot-
swap disk drives (SAF-TE) and another channel connected to an expansion cabinet (Fault-Bus) is not
supported.

Front Panel Interface
1-8 Server Description
Front Panel Interface
The system front panel control board contains these components:
• Power and reset switches
• System speaker
• LED indicators for power-on, power-fail, fan-fail, and drive fault
• LCD character display
• Chassis intrusion alarm switch connectors
The LCD displays two lines of 16 characters each. You can modify the LCD display through the
configuration utility. The electrical interface is compatible with commercially available LCDs. For
information on customizing the LCD display, refer to Chapter 3 of the DIGITAL Server 9100 Series
System Software Guide.
The upper portion of the following figure shows the front panel control board as viewed from the front.
The lower portion of the figure shows the location of the board as installed in the chassis.

Front Panel Interface
DIGITAL Server 9100 Series User's Guide 1-9
Front Panel Control Board
OM04366
FAB C DE G H IJ
MLNK
A Signal from intrusion switch at back edge near power supply three; 3-pin, right-angle, latching-
style connector
B Power on/off switch
C Reset switch
D Power-on LED, green
E Power-fail LED, yellow
F Fan-fail LED, yellow
G Drive-fault LED, yellow
H Speaker
I Signal from intrusion switch at back edge near power supply one; 3-pin, right-angle, latching-style
connector
J Signal interface to LCD; 14-pin, straight-head connector
K Power to LCD; 3-pin, straight-head, latching-style connector
L Hard drive bay intrusion switch (from EMI door intrusion sensor)
M NMI switch (not a button switch; a recessed switch accessible through a small hole)
N Signal interface to primary system board; 40-pin, straight-head connector (pin 17 removed)

System Board Sets
1-10 Server Description
System Board Sets
The “system board set” reflects the type and number of boards available for a particular configuration.
Board Set for a Dual System Board Configuration
The system board set for a dual system board configuration includes the following:
• Primary and secondary system boards
• Up to four processor boards
• One to two memory boards
• Bus termination board (required in any slot in which processor board is not installed)
Primary System Board Features
The following table summarizes the primary system board features.
Primary System
Board Feature Description
Multiple processor
support Two processor board slots. Up to Four Pentium Pro microprocessors (two on each processor board). Either a processor board or a bus termination board
must be plugged into the system board.
Upgradable memory One slot for memory board, supporting up to 4 GB memory using 256 MB
DIMMs.
Note: System memory data coherency is maintained using a Line Status Table
(LST) SIMM on the system board. Whenever a memory board is resident, an
LST SIMM module must also be resident.
Add-in board support Three dedicated EISA bus slots
Six dedicated 32-bit PCI slots; dual (peer) bus architecture
One shared PCI/EISA slot
SCSI controllers Two onboard SCSI-2 controllers; Ultra SCSI channel support (PCI-based)
BIOS Flash memory-based BIOS (Basic Input/Output System) and Setup utilities
Intermodule connector Used to connect the primary and secondary system boards. A 266-pin
receptacle-type connector into which the secondary system board is plugged.
Video Integrated super VGA controller chip with 1 MB of video memory
External device
connectors Onboard connectors for two serial ports, parallel port, PS/2-compatible keyboard and mouse, and VGA monitor
Clock Real-time clock/calendar (RTC) chip
System hardware
monitoring Detects chassis intrusion and contains sensors for temperature, voltage, and fan failure

System Board Sets
DIGITAL Server 9100 Series User's Guide 1-11
Secondary System Board Features
The following table presents the secondary system board features.
Secondary System
Board Feature Description
Multiple processor
support Two slots for processor board slots. Up to four Pentium Pro microprocessors (two on each processor board). Either a processor board or a bus termination
board must be plugged into the system board.
Upgradable memory One slot for memory board, supporting up to 4 GB memory using 256 MB
DIMMs. For an eight-processor system, both system boards must contain a
memory board with an equal amount of memory.
Note: System memory data coherency is maintained using a Line Status Table
(LST) SIMM on the system board. Whenever a memory board is resident, an
LST SIMM module must also be resident.
Add-in board support Eight dedicated 32-bit PCI slots on secondary system board; dual (peer) bus
architecture
SCSI controller One onboard SCSI-2; Ultra SCSI channel support (PCI-based)
Intermodule connector Used to connect primary and secondary system boards. On the secondary
system board, this is a plug-type connector which is inserted into the
intermodule connector receptacle on the primary system board.

System Board Sets
1-12 Server Description
Configuration Restrictions for System Boards
Certain restrictions have been defined for configuring the primary and secondary system boards to
optimize server performance.
Configuration Restrictions for the Primary System Board
Following are the configuration restrictions for the primary system board:
• The maximum number of PCI and EISA adapters you can install on the primary system board is 10,
in either of the following configurations:
– 6 PCI and 4 EISA
– 7 PCI and 3 EISA
• On the primary system board, either a processor board or a bus termination board must be plugged
into the second processor board slot.
• If you install a video controller adapter in one of the PCI bus 0 or EISA slots, the onboard VGA
controller is disabled. You must attach the monitor to the add-in video controller.
Configuration Restrictions for Both System Boards
Following are the configuration restrictions that apply to both system boards:
• For systems with up to seven processors, the memory board on primary system board is filled first
with memory modules. Once that memory board is full, the second memory board on the secondary
system board is added and populated.
• For systems with eight processors, a memory board is put on each system board and must contain a
balanced memory load (a minimum of 128 MB per memory board for a total minimum of 256 MB).
• On the secondary system board, either a processor board or a bus termination board must be plugged
into each processor board connector (CPU 3 and CPU 4).
• All processors on the system boards must be of the same speed and cache size.
• If any memory board is installed on a system board, an LST SIMM module must be installed in the
LST SIMM socket. If 200 MHz/1 MB cache processors are resident, use a 1024K LST SIMM module.
If both system boards contain an LST SIMM module, then the LST SIMM module must be the same
size.
Note: To read about restrictions on configuring specific add-in boards, refer to “Configuration
Restrictions for Add-in Boards” later in this chapter.
To read about configuration restrictions for memory boards, refer to “4 GB Memory Board DIMM
Configuration Restrictions,” which appears later in this chapter.

System Board Sets
DIGITAL Server 9100 Series User's Guide 1-13
Primary System Board Connector and Component Locations
The following figure shows the connector and component locations on the primary system board.
Connector and Component Locations on the Primary System Board
A
AA
Z
Y
X
W
V
U
T
S
Q
R
E
G
F
I
K
H
J
L
M
N
O
BCD
P
Label Connector/component Label Connector/Component
A Power control and status (PS3) O I2C connector (not used)
B +5 V, +12 V, and 3.3 V power connectors
(PS1 and PS2) (identical) P SCSI bus connectors: Channel A to the right, Channel B to the left
C Diskette drive connector Q EISA slots 2, 3, and 4 for add-in boards (slot 2
toward top, 4 at bottom)
D Front panel connector R Shared slot for PCI (slot 7) and EISA (slot 1)
add-in board
EConnector−Not Used S PCI slots 1-6 for add-in boards (slot 1 at top;
Bus 0=slots 1-3, 7; Bus 1=slots 4-6)
F 12 V power plane connector T 3.3 V PCI power connector
G Memory board connector U Processor LEDs (DS1, DS2, DS3, DS4)
H Real-time clock battery V Configuration switches and jumpers
I 5.1 V power plane connector W LST SIMM connector
J CPU 2 processor board or termination board
connector X Parallel port connector
K 3.3 V power plane connector Y VGA monitor connector
L CPU1 processor board connector Z Serial port connectors A (COM1) and B (COM2)
M Intermodule connector (on back side of board) AA PS/2-compatible keyboard & mouse connectors
N Fan fail connector (inner chassis fans)

System Board Sets
1-14 Server Description
Secondary System Board Connector and Component Locations
The following figure shows the connector and component locations on the secondary system board.
Note: A secondary system board is only available on DIGITAL Server 9105 (FR-M2A2W-BX) or
provided as part of an upgrade to the DIGITAL Server 9100 (FR-M2A2W-AX).
Connector and Component Locations on the Secondary System Board
B
I
E
C
F
G
D
H
K
L
M
N
A
J
Label Connector/component
A +5 V, +12 V, and 3.3 V power connectors (PS1 and PS2) (identical)
B Power control and status (PS3)
C Memory board connector
D CPU 4 processor board or termination board connector
E LST SIMM connector
F CPU 3 processor board connector
G Processor LEDs (DS1, DS2, DS3, DS4)
H 3.3 V PCI power connector
I PCI slots 8-15 for add-in boards (numbered from top to bottom: 12, 13, 14, 15, 8, 9, 10, 11;
Bus 2=slots 8-11; Bus 3=slots 12-15)
J SCSI bus connector Channel C
K Intermodule connector (located on back side of board)
L 3.3 V power plane connector
M 5.1 V power plane connector
N 12 V power plane connector